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Access denied for user 'xxx'@'localhost' 问题的解决方法

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12/01
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使用SpringMvc + Mybatis + Mysql搭建的架构，调试时出现了以下错误： 

HTTP Status 500 - Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Access denied for user 'Lzj'@'localhost' (using password: YES)

type Exception report

message Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Access denied for user 'Lzj'@'localhost' (using password: YES)

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Access denied for user 'Lzj'@'localhost' (using password: YES)

    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)

    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Access denied for user 'Lzj'@'localhost' (using password: YES)

    org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:289)

    org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)

    org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:447)

    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:277)

    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)

    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)

    com.sun.proxy.$Proxy15.list(Unknown Source)

    com.lzj.controller.HelloController.hello(HelloController.java:25)

    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    java.lang.reflect.Method.invoke(Method.java:498)

    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)

    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)

    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)

    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)

    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)

    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)

    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

java.sql.SQLException: Access denied for user 'Lzj'@'localhost' (using password: YES)

    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)

    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)

    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)

    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:873)

    com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1710)

    com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)

    com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2205)

    com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2236)

    com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2035)

    com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)

    com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

    java.lang.reflect.Constructor.newInstance(Constructor.java:423)

    com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

    com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)

    com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)

    java.sql.DriverManager.getConnection(DriverManager.java:664)

    java.sql.DriverManager.getConnection(DriverManager.java:208)

    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:153)

    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:144)

    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:196)

    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:159)

    org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:246)

    org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)

    org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:447)

    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:277)

    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)

    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)

    com.sun.proxy.$Proxy15.list(Unknown Source)

    com.lzj.controller.HelloController.hello(HelloController.java:25)

    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    java.lang.reflect.Method.invoke(Method.java:498)

    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)

    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)

    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)

    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)

    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)

    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)

    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

网上的一些说法是数据库没有访问权限，当然这是一种情况。

起始还有另一种可能，就是框架没有拿到datasource正确的username，这个和配置有关：

我原先的applicationContext.xml文件配置是这样的： 

    <!-- 加载properties -->

    <context:property-placeholder location="classpath:datasource.properties" />

    <!--  配置datasource  -->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >

        <property name="driverClassName" value="${driverClassName}"/>

        <property name="url" value="${url}"/>

        <property name="username" value="${username}"/>

        <property name="password" value="${password}"/>

    </bean>
datasource.properties文件代码如下：
driverClassName=com.mysql.jdbc.Driver

url=jdbc:mysql://127.0.0.1:3306/test

username=root

password=test

这样框架在构造AbstractDriverBasedDataSource实例时，拿到的username始终是当前机器名。

我也没有找到构造username的代码！

最后将datasource.properties文件的username改为jdbc.username,即： 

driverClassName=com.mysql.jdbc.Driver

url=jdbc:mysql://127.0.0.1:3306/test

jdbc.username=root

password=test

applicationContext.xml文件的dataSource的bean配置如下： 

    <!--  配置datasource  -->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >

        <property name="driverClassName" value="${driverClassName}"/>

        <property name="url" value="${url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${password}"/>

    </bean>

这样就解决了，每次都拿错username的问题。具体是什么原因，我也不知道。还需要在研读源码。

各位如有知道原因的，请留言。

后续如有答案，我会补上。

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